{
  "type": "object",
  "required": [
    "closed_at",
    "merged_at",
    "closed_by",
    "merged_by"
  ],
  "properties": {
    "closed_at": {
      "type": [
        "string",
        "null"
      ],
      "format": "date-time"
    },
    "merged_at": {
      "type": [
        "string",
        "null"
      ],
      "format": "date-time"
    },
    "closed_by": {
      "oneOf": [
        {
          "type": "null"
        },
        {
          "$ref": "user.json"
        }
      ]
    },
    "merged_by": {
      "oneOf": [
        {
          "type": "null"
        },
        {
          "$ref": "user.json"
        }
      ]
    }
  },
  "additionalProperties": false
}